Hi
I've spent a few days looking through various forums but struggling to find an answer. I realise I'm going to have to find a Jag specialist (recommendations in Lancashire/Manchester UK please) in the very near future but want to go with an idea of what the issue could be.

Went in to RP mode last week, had been out earlier in day no issues, popped to the take-away and car felt like it was mis-firing. When stationary the revs dropped when accelerator pressed to move-off and then it went in to RP mode.

I ordered an OBD2 reader online but before it arrived decided I'd clean the MAF sensors as seen this could cause some problems - they looked clean but coated in contact cleaner anyway. I don't know if it's just in my head, but it doesn't seem as lumpy although it still wasn't right.

Anyway, code reader arrived and showed up two:
P006A Jaguar Manifold Absolute Pressure (MAP) Mass or Volume Air Flow Correlation
P1247 Turbo Boost Pressure Low

I took out the MAP sensor and it is dirty - am I safe to clean this with electrical contact cleaner as with MAF? Could this be causing the P006a error code? I'm reluctant to change the part but that's why I'm asking on here!


MAP Sensor

MAP Sensor

On the 2nd code I'm not sure. I don't know how much whistle the turbo should make but with the bonnet open I did think it sounded loud. Wondered if it could be a split pipe but not sure where to start looking an no easy access to view - there's a lot of engine in a small space. It revs to around 1500rpm before it gets loud and the engine doesn't sound great, however I haven't driven it since the RP warning.

I would really like this not to be a cracked inlet manifold - I have looked and cannot see any obvious signs of oil leakage - or intercooler. I am wondering if a cracked intercooler pipe could be causing the loud whistle and triggering these errors. I am going to reset the codes and see if they come back when I take it out tomorrow - I will be back.

Any help will be much appreciated.

 

The X250 uses 'extended' (4 + 2) DTC codes and it required Jaguar SDD (Symptom Driven Diagnostics) to read these.

However, the most likely cause for the combination of P006A-xx with P1247-xx is intake air system, high pressure boost leak bi-turbo mode bank 2. Here is the relevant section from the Workshop Manual:





Your reluctance to change the MAP sensor is wise. Throwing parts at a Jaguar can soon become very expensive!

Graham

 

You may have a crack in one of the plastic intake manifolds.

EDIT:- I should have been more helpful. Take the cover off the engine. On top of each bank will be a rubbery plastic cover over the injectors. Carefully peel one back (not off, as they can be a pain to reseat) poke your fingers down & have a good feel about. If your fingers have oily, carbon muck on them, there's a very good chance you've got a cracked manifold. Repeat check on other bank.

Even if only one cracked manifold, get them both done. It's only a matter of time before the other one goes.

 

Hi I had I same bother with mine . About a year and a half ago I had to have the intercooler replaced which ha a crack in it car ran great after that . And a few weeks ago it started playing up again so bit the bullet and put it into garage .inlet manifold drivers side was cracked so had that replaced . Car ran ok after till I put my foot down and the dreaded RP came back but no codes . So I decided to investigate myself .. Found out the vacuum hoses on turbo solenoid behind throttle body intake housing were disconnected so using small cable ties I reconnected them and the car is running like a dream again ..sorry bout the long winded note .Rob

 

Welcome to the forums Rob,

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Thanks to all for the replies.

A friend who works on land rovers suggested looking at the Compressor Shut-off Valve as it can stick and cause problems. Looking for this I discovered the hose connecting it to the intercooler was disconnected! It was a relief but also a massive PITA! After many attempts to re-connect it from above, I found a friendly local mechanic who lent me a ramp for half an hour, reconnected the hose, the warning has gone and my smile machine is back (for now)!

Going for a new door lock actuator tomorrow and I have a feeling I’m going to be good friends with the Jag specialist sooner than I’d like.